GPR Signature Detection and Decomposition for Mapping Buried Utilities with Complex Spatial Configuration
Publication: Journal of Computing in Civil Engineering
Volume 32, Issue 4
Abstract
The information of exact locations of underground utilities is an essential piece of evidence for preventing utility strikes in excavation work. Ground penetrating radar (GPR), which has emerged as a promising, nondestructive solution for this purpose, is capable of capturing radar reflections that are then recorded as GPR scans. To determine the location, dimension, size, and spatial configuration of pipes, radargrams must be further interpreted to extract the shapes (e.g., hyperbolas and lines) and to identify the feature components (e.g., hyperbola apex, rising and trailing segment, and junctions of intersecting hyperbolas). This paper introduces a new drop–flow algorithm that automates the detection and decomposition of GPR signatures into feature components in two-dimensional scans. Commencing at a strip of pixels from the top of the edge of the scan image, the algorithm mimics the motion of a raindrop falling or flowing as it touches the edge pixels of the image. The movement of the raindrop completes the decomposition of the GPR signature when it touches the ground (i.e., the bottom of the edge image). This new algorithm was tested using both synthetic and field data. The promising results indicate the drop–flow algorithm’s ability to segment the intersecting hyperbolas and to identify the feature components of each hyperbola, forming the basis for estimating the spatial configuration, size, and location of underground pipes.
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Acknowledgments
This research was partially funded by the National Science Foundation (NSF) via Grant CMMI-1462638. The authors gratefully acknowledge NSF’s support. Any opinions, findings, and conclusions in this paper are those of the authors and do not necessarily reflect the views of NSF or Purdue University.
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Received: Jun 21, 2017
Accepted: Nov 9, 2017
Published online: May 9, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 9, 2018
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